Vendor dependencies for 0.3.0 release

vendor/windows-result/src/bstr.rs

@@ -0,0 +1,40 @@
+use super::*;
+use core::ops::Deref;
+
+#[repr(transparent)]
+pub struct BasicString(*const u16);
+
+impl Deref for BasicString {
+    type Target = [u16];
+
+    fn deref(&self) -> &[u16] {
+        let len = if self.0.is_null() {
+            0
+        } else {
+            unsafe { SysStringLen(self.0) as usize }
+        };
+
+        if len > 0 {
+            unsafe { core::slice::from_raw_parts(self.0, len) }
+        } else {
+            // This ensures that if `as_ptr` is called on the slice that the resulting pointer
+            // will still refer to a null-terminated string.
+            const EMPTY: [u16; 1] = [0];
+            &EMPTY[..0]
+        }
+    }
+}
+
+impl Default for BasicString {
+    fn default() -> Self {
+        Self(core::ptr::null_mut())
+    }
+}
+
+impl Drop for BasicString {
+    fn drop(&mut self) {
+        if !self.0.is_null() {
+            unsafe { SysFreeString(self.0) }
+        }
+    }
+}